Backpack



FIG. 1 is a front perspective view of a backpack according to a first embodiment of the present invention;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front perspective view of a backpack according to a second embodiment of the present invention;

FIG. 8 is a front elevation view of the embodiment of FIG. 7;

FIG. 9 is a rear elevation view of the embodiment of FIG. 7;

FIG. 10 is a right elevation view of the embodiment of FIG. 7; and,

FIG. 11 is a left elevation view of the embodiment of FIG. 7.

The broken lines in the drawings depict portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 